Determination oftrans-octadecenoic acids in german margarines, shortenings, cooking and dietary fats by Ag-TLC/GC (original) (raw)

Summary

According to numerous, even recent studies,trans fatty acids (TFA) are related to coronary heart disease. Thus, for the evaluation of the daily TFA-intake precise data on the content of TFA in currently available edible fats are of great interest. The present study gives a comprehensive overview on total_trans_-octadecenoic acid contents in 93 brands of German margarines, shortenings, cooking and dietary fats purchased in 1994, that were obtained by a two-dimensional chromatography method (Ag-TLC/GC). Conventional margarines were found to contain 0.17 – 25.90 wt% (n=46) and shortenings/cooking fats 0.04–32.51 wt% (n=16) TFA related to total fatty acids. Mean values were 9.32 resp. 9.79 %, whereas dietary and reformatory fats exhibited a mean of 0.65 % (n=31) TFA. Among conventional margarines the highest TFA contents were detected in products (n=11) derived exclusively from sunflower oil (mean value=20.71 %). Seasonal changes in single brands were relatively small.

Zusammenfassung

Zahlreichen, auch neueren Studien zufolge werden_trans_-Fettsäuren (TFA) mit koronaren Herzerkrankungen in Zusammenhang gebracht. Für eine Berechnung der täglichen TFA-Aufnahme sind deshalb präzise Angaben über den aktuellen Gehalt von TFA in handelsüblichen Speisefetten von großem Interesse. Die vorliegende Arbeit gibt einen umfassenden Überblick der Gesamtgehalte an_trans_-Octadecensäuren in 93 Marken von im Jahre 1994 gekauften deutschen Margarinen, Back-, Brat- und Diätfetten, die mit Hilfe einer zweidimensionalen chromatographischen Methode (Ag-TLC/GC) ermittelt wurden. Danach enthielten konventionelle Margarinen 0,17–25,90 Gew% (n=46) und Back-/Bratfette 0,04–32,51 Gew% (n=16) TFA bezogen auf die gesamten Fettsäuren. Die Mittelwerte betrugen 9,32 % bzw. 9,79 %, während Diät- und Reformfette im Mittel 0,65 % (n=31) TFA aufwiesen. Unter den konventionellen Margarinen zeigten die ausschließlich aus Sonnenblumenöl hergestellten Produkte (n=11) die höchsten TFA-Gehalte (Mittelwert=20,71 %). Jahreszeitliche Schwankungen innerhalb einzelner Marken waren relativ gering.

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Abbreviations

FA :

fatty acid

FAME :

fatty acid methyl ester

GC :

gas chromatography

TFA :

trans fatty acid

Ag-TLC :

argentation thin-layer chromatography

C18:1 :

octadecenoic acids

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  1. Bundesanstalt für Milchforschung, Institut für Chemie und Physik, Postfach 60 69, D-24121, Kiel
    J. Molkentin & D. Precht

Authors

  1. J. Molkentin
  2. D. Precht

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Molkentin, J., Precht, D. Determination of_trans_-octadecenoic acids in german margarines, shortenings, cooking and dietary fats by Ag-TLC/GC.Z Ernährungswiss 34, 314–317 (1995). https://doi.org/10.1007/BF01625344

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